HTC Desire Z: Firmware Downgrade (Gingerbread)

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This guide will walk you through the process of taking the HTC Desire Z from stock Gingerbread firmware to a stock, exploitable version of the Froyo firmware. Once it is downgraded, you would proceed thru the process of getting CyanogenMod on the device. If the HTC Desire Z is already running firmware version 1.34.xxx.x or lower (Settings » About Phone) you can skip to the HTC Desire Z: Rooting guide.

Before you do anything — Make a backup

Don't forget to back up your data. If you have synced the device with a Google account, then the contacts, calendar, Gmail, & select other Google-related data will not be lost and will come back after the next sync. However, you should backup anything you want to keep that is not stored on the SD card:

It would also be a good idea to backup everything stored on the SD card in the rare case the SD card must be formatted to resolve any major problems.

MyBackup Root, SMS Backup & Restore, and Call Backup & Restore are all free applications that can assist with backing up your data.

Downgrading to 1.34.707.3

  1. You will need ADB on the computer to proceed thru this process. Follow the Android SDK guide, to get the ADB shell on the computer.
  2. Download fre3vo, misc_version 0.2 & the 1.34.707.3 firmware:
    • fre3vo: Download
      md5: 010e076a4a93be876579711bf8934c70
    • misc_version 0.2: Download
      md5: 1f40aaf88d1bf15775631a58c4361218
    • 1.34.707.3 firmware: Download
      md5: 8aa11b9e9db9877b029f37caec49547d
  3. Unzip the fre3vo & misc_version packages to the same folder as adb (the /platform-tools folder within the Android SDK folder).
  4. Make sure the filename of the firmware is PC10IMG.zip exactly or it will not work and copy it to the same folder as adb.
  5. Connect the HTC Desire Z to the computer via USB.
  6. On the computer, open terminal and run the following commands:
    adb push fre3vo /data/local/tmp
    adb push misc_version /data/local/tmp
    adb shell
    chmod 777 /data/local/tmp/fre3vo
    chmod 777 /data/local/tmp/misc_version
    /data/local/tmp/fre3vo -debug -start FAA90000 -end FFFFFFFF
    adb shell
    NOTE: You should have the "#" sign instead of the "$". If you do, you have temporary root, and can continue on. If you have the "$", then the exploit has failed, refer to xda developers, RootzWiki, or #G2Root for further assistance.
    /data/local/tmp/misc_version -s 1.00.000.0
    exit
  7. Now that misc version has been downgraded, the HTC Desire Z is ready to have the firmware downgraded. On the computer, open terminal and run the following commands:
    adb push PC10IMG.zip /sdcard/PC10IMG.zip
    adb reboot bootloader
  8. Use Volume up/down keys on the HTC Desire Z for navigation and Power key for confirmation. Select Bootloader to flash the 1.34.707.3 firmware.
  9. Once finished you can can continue to the next section.

Rooting the HTC Desire Z

Please follow the Rooting guide to continue.
Retrieved from "http://wiki.cyanogenmod.com/wiki/HTC_Desire_Z:_Firmware_Downgrade_(Gingerbread)"
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